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Table 2 Correlation coefficients for low and high volumes of expired air and the three ultrasound methods to measure diaphragm movement

From: The Area method: a new method for ultrasound assessment of diaphragmatic movement

  Mean Low volume High volume
Correlation coefficient 95% CI p value Correlation coefficient 95% CI p value
M-mode 4.49 0.85 (0.74–0.96) < 0.01 0.43 (0.17–0.68) < 0.01
Area method 3.78 0.84 (0.71–0.96) < 0.01 0.29 (0.07–0.64) 0.11
B-mode 3.82 0.61 (0.35–0.86) < 0.01 0.14 (− 0.19–0.48) 0.4